This document discusses rapid prototyping using Vue.js. It defines rapid prototyping as a design process that is constantly readjusting direction based on open questions. Vue.js is presented as a useful tool for rapid prototyping because it allows for quick adjustments and collaboration between designers and developers. The document also outlines when Vue.js may be most suitable for prototyping, such as when it is the fastest tool, technically feasible, and can provide value to later development stages.